The singer appeared to throw some shade at her ex Harry Styles and his band, One Direction, when she seemingly unleashed a potty-mouthed zinger Sunday night at the MTV Video Music Awards while the boy banders took the stage.

Sitting with pal Selena Gomez, the 23-year-old Swift was watching One Direction from the audience when she appeared to mouth the words "Shut the f--k up."

Chalk it up to yet another watercooler moment from the singer at the VMAs: Earlier in the night, while accepting the award for Best Female Video for "I Knew You Were Trouble," Swift gave a shout-out to "who I wrote this song about cause you know who you are and now I have this award."